Finding the Fourth Proportional to 99.82, 149.37 and 86.46

Step by Step Solution

1. Step 1: Write the proportion equation
   99.82 : 149.37 = 86.46 : x
2. Step 2: Convert to fraction form
   99.82/149.37 = 86.46/x
3. Step 3: Cross multiply
   99.82x = 149.37 × 86.46
4. Step 4: Simplify right side
   99.82x = 12,914.53
5. Step 5: Solve for x
   x = 12,914.53/99.82
6. Step 6: Final answer
   x = 129.38